Update Constants as per updated eth2.0 spec (#1682)

* Remove MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL constant throughout

* Update INACTIVITY_PENALTY_QUOTIENT to 2**24

* Update TARGET_COMMITTEE_SIZE to 128

Author: Bhargavasomu

eth/beacon/state_machines/configs.py

@@ -34,7 +34,6 @@
         ('SLOT_DURATION', int),
         ('MIN_ATTESTATION_INCLUSION_DELAY', int),
         ('EPOCH_LENGTH', int),
-        ('MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL', int),
         ('POW_RECEIPT_ROOT_VOTING_PERIOD', int),
         ('SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD', int),
         ('COLLECTIVE_PENALTY_CALCULATION_PERIOD', int),

eth/beacon/state_machines/forks/serenity/configs.py

@@ -7,7 +7,7 @@
 SERENITY_CONFIG = BeaconConfig(
     # Misc
     SHARD_COUNT=2**10,  # (= 1,024) shards
-    TARGET_COMMITTEE_SIZE=2**8,  # (= 256) validators
+    TARGET_COMMITTEE_SIZE=2**7,  # (= 128) validators
     EJECTION_BALANCE=2**4,  # (= 16) ETH
     MAX_BALANCE_CHURN_QUOTIENT=2**5,  # (= 32)
     BEACON_CHAIN_SHARD_NUMBER=2**64 - 1,
@@ -27,7 +27,6 @@
     SLOT_DURATION=6,  # seconds
     MIN_ATTESTATION_INCLUSION_DELAY=2**2,  # (= 4) slots
     EPOCH_LENGTH=2**6,  # (= 64) slots
-    MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL=2**8,  # (= 256) slots
     POW_RECEIPT_ROOT_VOTING_PERIOD=2**10,  # (= 1,024) slots
     SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD=2**17,  # (= 131,072) slots
     COLLECTIVE_PENALTY_CALCULATION_PERIOD=2**20,  # (= 1,048,576) slots
@@ -36,7 +35,7 @@
     BASE_REWARD_QUOTIENT=2**10,  # (= 1,024)
     WHISTLEBLOWER_REWARD_QUOTIENT=2**9,  # (= 512)
     INCLUDER_REWARD_QUOTIENT=2**3,  # (= 8)
-    INACTIVITY_PENALTY_QUOTIENT=2**34,  # (= 17,179,869,184)
+    INACTIVITY_PENALTY_QUOTIENT=2**24,  # (= 16,777,216)
     # Max operations per block
     MAX_PROPOSER_SLASHINGS=2**4,  # (= 16)
     MAX_CASPER_SLASHINGS=2**4,  # (= 16)

tests/beacon/conftest.py

@@ -436,11 +436,6 @@ def epoch_length():
     return SERENITY_CONFIG.EPOCH_LENGTH
 
 
-@pytest.fixture
-def min_validator_registry_change_interval():
-    return SERENITY_CONFIG.MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL
-
-
 @pytest.fixture
 def pow_receipt_root_voting_period():
     return SERENITY_CONFIG.POW_RECEIPT_ROOT_VOTING_PERIOD

tests/beacon/state_machines/conftest.py

@@ -26,7 +26,6 @@ def config(
         slot_duration,
         min_attestation_inclusion_delay,
         epoch_length,
-        min_validator_registry_change_interval,
         pow_receipt_root_voting_period,
         shard_persistent_committee_change_period,
         collective_penalty_calculation_period,
@@ -60,7 +59,6 @@ def config(
         SLOT_DURATION=slot_duration,
         MIN_ATTESTATION_INCLUSION_DELAY=min_attestation_inclusion_delay,
         EPOCH_LENGTH=epoch_length,
-        MIN_VALIDATOR_REGISTRY_CHANGE_INTERVAL=min_validator_registry_change_interval,
         POW_RECEIPT_ROOT_VOTING_PERIOD=pow_receipt_root_voting_period,
         SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD=shard_persistent_committee_change_period,
         COLLECTIVE_PENALTY_CALCULATION_PERIOD=collective_penalty_calculation_period,